Chow Tai Fook's gold can be exchanged at Lukfook, at least in Hong Kong. In Chinese mainland, Luk Fook's gold can also be exchanged at Chow Tai Fook. Just sell the old gold to Chow Tai Fook (that is, it is 20/ gram lower than the gold price of that day) and then it is about 4 grams heavier than the original. Gold can be exchanged as long as its purity is almost the same, but it is a bit uneconomical.